National Instruments 323006A-01 User Manual download pdf (Page 18)

Chapter 2 PXI-1006 Features

PXI-1006 User Manual 2-6 ni.com

Trigger Bus

The PXI-1006 has three PXI segments. Vertical bars represent the segment

divisions on the front of the chassis. (See Figure 2-1 for the segment divider

locations.) The PXI trigger bus is divided into three separate trigger buses

at these locations. You can use the trigger lines in a variety of ways. For

example, you can use triggers to synchronize the operation of several

different PXI peripheral modules. In other applications, one module can

control carefully timed sequences of operations performed on other

modules in the system. Modules can pass triggers to one another, allowing

precisely timed responses to asynchronous external events the system is

monitoring or controlling.

System Reference Clock

The PXI-1006 supplies the PXI 10 MHz system clock signal (PXI_CLK10)

independently to every peripheral slot. An independent buffer (having a

source impedance matched to the backplane and a skew of less than 1 ns

between slots) drives the clock signal to each peripheral slot. You can use

this common reference clock signal to synchronize multiple modules in a

measurement or control system. You can drive PXI_CLK10 from an

external source through the PXI_CLK10_IN pin on the P2 connector of the

star trigger slot. (See Table B-1, P1 (J1) Connector Pinout for the System

Controller Slot.) Sourcing an external clock on this pin automatically

disables the backplane’s 10 MHz source.

Rack Mounting

Rack-mount applications require the optional rack-mount kit available

from National Instruments. Refer to the instructions supplied with the

rack-mount kit to install your PXI-1006 in a standard 19 in. instrument

rack.

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National Instruments 323006A-01 User Manual Page 18